/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:02:40,678 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 22:02:40,701 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:02:40,702 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:02:40,703 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:02:40,704 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:02:40,705 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:02:40,705 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:02:40,707 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:02:40,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:02:40,710 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:02:40,711 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:02:40,712 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:02:40,713 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:02:40,716 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:02:40,725 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:02:40,740 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:02:40,740 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:02:40,743 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:02:40,744 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:02:40,744 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:02:40,744 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:02:40,744 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:02:40,745 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:02:40,745 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:02:40,745 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:02:40,746 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:02:40,746 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:02:40,746 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:02:40,746 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:02:40,746 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:02:40,747 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:02:40,747 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:02:40,747 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:02:40,747 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:02:40,748 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:02:40,748 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:02:40,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:40,748 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:02:40,748 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:02:40,749 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:02:40,749 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:02:40,749 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:40,749 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:02:40,749 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:02:40,750 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:02:41,035 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:02:41,049 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:02:41,053 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:02:41,054 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:02:41,054 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:02:41,055 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-21 22:02:41,112 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a90b769d/8f9d1acc18394a9fb311daf8253cf84c/FLAG05396d526 [2020-07-21 22:02:41,523 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:02:41,524 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-21 22:02:41,530 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a90b769d/8f9d1acc18394a9fb311daf8253cf84c/FLAG05396d526 [2020-07-21 22:02:41,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a90b769d/8f9d1acc18394a9fb311daf8253cf84c [2020-07-21 22:02:41,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:02:41,947 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:02:41,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:41,949 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:02:41,953 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:02:41,954 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:41" (1/1) ... [2020-07-21 22:02:41,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@662a784d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:41, skipping insertion in model container [2020-07-21 22:02:41,957 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:41" (1/1) ... [2020-07-21 22:02:41,966 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:02:41,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:02:42,197 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:42,200 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:02:42,215 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:42,228 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:02:42,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42 WrapperNode [2020-07-21 22:02:42,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:42,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:02:42,229 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:02:42,229 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:02:42,242 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,248 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,248 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,252 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,254 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... [2020-07-21 22:02:42,256 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:02:42,256 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:02:42,257 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:02:42,257 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:02:42,257 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:42,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:02:42,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:02:42,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-21 22:02:42,404 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:02:42,404 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:02:42,404 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:02:42,404 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-21 22:02:42,404 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:02:42,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:02:42,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:02:42,592 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:02:42,592 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:02:42,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:42 BoogieIcfgContainer [2020-07-21 22:02:42,595 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:02:42,596 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:02:42,596 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:02:42,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:02:42,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:02:41" (1/3) ... [2020-07-21 22:02:42,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d5cbaad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:42, skipping insertion in model container [2020-07-21 22:02:42,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:42" (2/3) ... [2020-07-21 22:02:42,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d5cbaad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:42, skipping insertion in model container [2020-07-21 22:02:42,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:42" (3/3) ... [2020-07-21 22:02:42,602 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-07-21 22:02:42,612 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:02:42,620 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:02:42,633 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:02:42,656 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:02:42,656 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:02:42,656 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:02:42,656 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:02:42,656 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:02:42,657 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:02:42,657 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:02:42,657 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:02:42,675 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 22:02:42,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 22:02:42,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:42,682 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:42,682 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:42,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:42,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-21 22:02:42,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:42,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497793911] [2020-07-21 22:02:42,695 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:42,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:42,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:42,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:42,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:42,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:42,854 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:42,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497793911] [2020-07-21 22:02:42,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:42,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:42,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335088623] [2020-07-21 22:02:42,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:42,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:42,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:42,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:42,889 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-21 22:02:43,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:43,032 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2020-07-21 22:02:43,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:43,034 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 22:02:43,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:43,045 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:02:43,045 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:02:43,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:43,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:02:43,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 22:02:43,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 22:02:43,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-21 22:02:43,097 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-21 22:02:43,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:43,097 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-21 22:02:43,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:43,098 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-21 22:02:43,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:02:43,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:43,101 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:43,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:43,313 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:43,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:43,314 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-21 22:02:43,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:43,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394593561] [2020-07-21 22:02:43,316 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:43,356 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:43,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:43,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:02:43,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:43,425 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:02:43,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:43,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:43,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:43,651 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:02:43,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394593561] [2020-07-21 22:02:43,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:43,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-21 22:02:43,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724935725] [2020-07-21 22:02:43,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 22:02:43,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:43,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 22:02:43,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 22:02:43,656 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-21 22:02:43,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:43,772 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-07-21 22:02:43,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:02:43,773 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 22:02:43,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:43,776 INFO L225 Difference]: With dead ends: 38 [2020-07-21 22:02:43,776 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 22:02:43,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:02:43,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 22:02:43,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-21 22:02:43,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 22:02:43,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-07-21 22:02:43,801 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 22 [2020-07-21 22:02:43,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:43,801 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-07-21 22:02:43,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 22:02:43,802 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-07-21 22:02:43,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 22:02:43,804 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:43,804 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:44,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:44,018 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:44,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:44,019 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-21 22:02:44,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:44,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049293589] [2020-07-21 22:02:44,020 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:44,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:44,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:44,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:02:44,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:44,083 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:02:44,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:44,141 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:02:44,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049293589] [2020-07-21 22:02:44,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:44,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-07-21 22:02:44,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532224633] [2020-07-21 22:02:44,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:44,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:44,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:44,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:44,144 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 5 states. [2020-07-21 22:02:44,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:44,199 INFO L93 Difference]: Finished difference Result 64 states and 116 transitions. [2020-07-21 22:02:44,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 22:02:44,199 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2020-07-21 22:02:44,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:44,202 INFO L225 Difference]: With dead ends: 64 [2020-07-21 22:02:44,202 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:02:44,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:44,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:02:44,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 22:02:44,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 22:02:44,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 59 transitions. [2020-07-21 22:02:44,217 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 59 transitions. Word has length 29 [2020-07-21 22:02:44,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:44,217 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 59 transitions. [2020-07-21 22:02:44,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:44,218 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 59 transitions. [2020-07-21 22:02:44,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 22:02:44,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:44,220 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:44,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:44,434 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:44,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:44,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-07-21 22:02:44,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:44,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028822703] [2020-07-21 22:02:44,435 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:44,477 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:44,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:02:44,478 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:02:44,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:02:44,490 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:02:44,507 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:02:44,508 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:02:44,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:44,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:02:44 BoogieIcfgContainer [2020-07-21 22:02:44,752 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:02:44,755 INFO L168 Benchmark]: Toolchain (without parser) took 2808.21 ms. Allocated memory was 145.2 MB in the beginning and 234.9 MB in the end (delta: 89.7 MB). Free memory was 103.5 MB in the beginning and 162.9 MB in the end (delta: -59.4 MB). Peak memory consumption was 30.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,756 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,757 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.95 ms. Allocated memory is still 145.2 MB. Free memory was 103.1 MB in the beginning and 93.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,758 INFO L168 Benchmark]: Boogie Preprocessor took 27.22 ms. Allocated memory is still 145.2 MB. Free memory was 93.5 MB in the beginning and 92.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,759 INFO L168 Benchmark]: RCFGBuilder took 338.56 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 167.8 MB in the end (delta: -75.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,760 INFO L168 Benchmark]: TraceAbstraction took 2156.26 ms. Allocated memory was 201.9 MB in the beginning and 234.9 MB in the end (delta: 33.0 MB). Free memory was 167.8 MB in the beginning and 162.9 MB in the end (delta: 4.9 MB). Peak memory consumption was 37.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:02:44,764 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.95 ms. Allocated memory is still 145.2 MB. Free memory was 103.1 MB in the beginning and 93.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.22 ms. Allocated memory is still 145.2 MB. Free memory was 93.5 MB in the beginning and 92.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 338.56 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 167.8 MB in the end (delta: -75.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2156.26 ms. Allocated memory was 201.9 MB in the beginning and 234.9 MB in the end (delta: 33.0 MB). Free memory was 167.8 MB in the beginning and 162.9 MB in the end (delta: 4.9 MB). Peak memory consumption was 37.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) VAL [m=2, n=0] [L39] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L18] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L18] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L21] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L18] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L43] __VERIFIER_error() VAL [m=2, n=0, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.0s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 71 SDtfs, 52 SDslu, 142 SDs, 0 SdLazy, 114 SolverSat, 37 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 119 GetRequests, 96 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 108 NumberOfCodeBlocks, 95 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4942 SizeOfPredicates, 7 NumberOfNonLiveVariables, 166 ConjunctsInSsa, 13 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 31/38 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...